ACTIONS OF SEX HORMONES ON OESTROUS CYCLE AND REPRODUCTION OF THE GOLDEN HAMSTER

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Abstract
Some biological features described by Bruce & Hindle [1934] arid by Deanesly [1938] suggest that the golden hamster might be a good subject for the study of sex hormones. For instance, the animal usually stops breeding at the very early age of 10 months, though it may attain an age of at least 2 years; and there are generally only three litters, though the period of gestation (16 days) is very short. As a rule the animals do not breed in the winter, though according to Deanesly [1938] the oestrous cycle continues regularly throughout the whole year. A detailed account of the histology of the ovaries and secondary sex organs, during the oestrous cycle and pregnancy, has been given by Deanesly [1938]. The action of oestrone and of progesterone on the vaginal mucosa in castrates has been studied by Klein [1937], who later [1938] showed the necessity of the corpus

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